１．Of the families in City X in 1994, 40 percent owned a personal computer.The number of families in City X owning a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in City X was 4 percent greater in 1998 than it was in 1994.What percent of the families in City X owned a personal computer in 1998?
A.50%
B.52%
C.56%
D.70%
E.74%
key is A. why?
2.Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day.If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?
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发表于 2008-2-7 22:32:00
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